Accession No
0274
Brief Description
solar microscope; made by W. Johns; circa 1800.
Origin
London; England
Maker
W. Johns
Class
microscopes
Earliest Date
1800
Latest Date
1800
Inscription Date
Material
glass (mirror); metal (brass); wood
Dimensions
box height 106mm; diameter 77mm; length 272mm; breadth 159mm; height 82mm
Special Collection
Robert Whipple collection
Provenance
Purchased from Andrew Baird, Edinburgh, in 07/1926.
Inscription
“W. Johns LONDON”
Description Notes
Brass; square frame with inner circular ring; rectangular mirror attached by a pin mounted in racked semicircular mount and adjusted by a knurled screw on the frame; second knurled screw operates rotating motion; 2 holes for attachment to shutter; Screw fit cylindrical body; condensing lens in screw fit brass cell; draw tube; racked screw-barrel type transparent object body; steel spring; 2 part brass stage moved by knurled screw 6 objective slider; with heart shaped handle. Fitted wooden box; tweezers; talc and ring box; stage forceps; live slide, simple lens.
References
Events
Description
To work a solar microscope, the mirror was placed outside a room via a hole in the window shutter, whilst the barrel remained in the room. The mirror reflected the sunlight through condensing lenses, the slide containing the object and projection lenses. The image was then projected onto a screen in the room.
03/07/2009
Created by: David Bud on 03/07/2009
FM:42398
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